JPH07227902A - Method and apparatus for automatically adjusting driving height of blow molding machine - Google Patents

Abstract

(57) [Abstract] [Purpose] A method and an apparatus for the purpose of automatically adjusting the abutting amount between the cutting sleeve of the driving blow pin and the counter plate of the mold in the blow molding machine. [Structure] The blow blow pin 15 of the hollow molding machine is configured to be able to move up and down by driving the electric motor 8, and the torque of the electric motor 8 can be set arbitrarily, so that the center of the mold 19 and the blow blow pin 15 can be set. Then, the torque is increased when the counter plate 25 of the mold 19 and the cutting sleeve 26 of the driving blow pin 15 come into contact with each other, and the value of the pulse encoder 27 at this time is set as a positioning command point. It was configured to do.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for automatically adjusting the driving height of a blow molding machine.

[0002]

2. Description of the Related Art A blow molding machine stores a parison supplied from a die head in a mold and blows air into the parison to blow a hollow resin into a cavity formed on the inner surface of the mold. This is a device for obtaining a molded product.

The driving device, as shown in FIGS. 5 and 6, is
A plate 41 fixed to the support base 40 having a predetermined height so that the position thereof can be adjusted in the left-right direction is supported by a plate 42 fixed so that the position can be adjusted in the up-and-down direction, and an arm 43 is fixed to the plate 42. A hydraulic cylinder or an air cylinder 44 is fixed to the upper portion of 43, and a guide rod 45 is hung and supported below the arm 43. A slide block 47 that is connected to a piston rod 46 that hangs from a hydraulic cylinder or an air cylinder 44 and that can move up and down along a guide rod 45 is provided. The slide block 47 has an air blowing nozzle at the center and a driving blow pin 48 having a cooling water passage at the outer periphery thereof.
Hangs down, and this blow-in blow pin 48 becomes a guide rod 45.
Is inserted in a stripper bush 50 fixed to a stripper plate 49 connected and supported at the lower end of the stripper plate.

As shown in FIG. 7, a nozzle body 51 connecting a pipe for supplying cooling water and air is connected to the upper end portion of the driving blow pin 48, and a screw rod 52 is connected to the nozzle body 51. Further, the screw rod 52 is screwed to and supported by a support block 53 fixed to the slide block 47 and protrudes above the slide block 47.

The screw rod 52 has its upper end turned by a jig to adjust the screwing condition, and the cutting sleeve 48a integrally formed with the driving blow pin 48 contacts the inclined surface of the counter plate 55 provided on the mold 54. This is to adjust the amount of striking.

Therefore, in FIG. 7, the driving blow pin 4 is used.
Mold halves 54, 54 which are clamped with a cylindrical parison between them move to the lower part of 8, and are driven directly above the cutting plates 55, 55 having the blowing ports of the dies 54, 54. When the blow pin 48 is positioned, oil or air is supplied to the hydraulic cylinder or the air cylinder 44, and the piston rod 4
6 to extend the slide block 47 into the guide rod 4
By pushing down along 5, the driving blow pin 48 hangs down from the stripper bush 50 and is inserted into the blowing port, as shown in phantom lines. Then, air is blown from the driving blow pin 48, and the parison is made into the mold 5.
It was that the product 56 was molded by bulging along the 4, 54 cavities.

[0007]

However, according to the conventional blow molding machine described above, the adjustment of the abutting amount of the cutting sleeve 48a of the driving blow pin 48 and the counter plate 55 is performed by fixing the upper end portion of the screw rod 52. Since the screwing degree is adjusted by turning with a tool, the screwing degree of the screw rod 52 must be finely adjusted each time the position of the counter plate 55 is changed, that is, when the product to be molded is changed.

During the molding, since the operator climbs to the upper part of the hollow molding machine and manually adjusts the screwing degree of the screw rod 52 during molding, it is dangerous because it is in operation. Further, the cutting sleeve and the counter plate may be abnormally worn or damaged due to an operator's adjustment error.

Therefore, an object of the present invention is to automate the adjustment of the abutting amount between the cutting sleeve of the driving blow pin and the counter plate of the mold in the blow molding machine.

[0010]

The method for automatically adjusting the driving height of a blow molding machine according to the present invention calculates the optimum driving force by inputting the diameter of the product, and based on this value, the driving lowering position. It is characterized by controlling the driving force.

Specifically, the blow blow pin of the blow molding machine is constructed so that it can be moved up and down by the drive of an electric motor, and the torque of the electric motor can be arbitrarily set so that the center of the mold and the blow blow pin is set. It is characterized in that it is lowered at a low speed after being adjusted, and the torque increase when the die counter plate and the cutting sleeve hit each other is detected, and the value of the pulse encoder at this time is used as the positioning command point.

Further, according to the present invention, there is provided an apparatus for automatically adjusting a driving height of a blow molding machine, wherein a servo motor having a pulse encoder, a servo amplifier, a ball screw rotated by the servo motor, and a ball screw engaged with the ball screw. It is characterized by comprising a driving blow pin mounted on an ascending / descending slide block, an operation indicator for calculating a driving height and a torque value by inputting a product diameter and obtaining a ratio to a rated torque, and a controller thereof. .

[0013]

The automatic display is commanded on the operation display, and the product diameter is input to calculate the driving force and the torque value, and the ratio to the rated torque is calculated. Therefore, the electric motor descends at a low speed, the pulse encoder detects the motor torque, and when the motor torque reaches the calculated torque value, the electric motor stops, the pulse encoder reads the pulse value, writes the driving down command point, and strikes. Return to the origin and finish.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIGS. 1 and 2, for example, four poles 2 are erected on the arm 1 and a plate 3 is mounted on the upper part of the pole 2.
A shaft 4 is rotatably supported on a substantially central portion of the plate 3, and a gear or pulley 5 is attached to an upper end portion of the shaft 5.
The plate 3 is supported by an electric motor 8 having a gear or pulley 7 which rotates via a chain or a belt 6 together with the gear or pulley 5.

The lower end of the shaft 4 is connected to the upper end of a ball screw 9, and the lower end of the ball screw 9 is rotatably supported by the arm 1. The ball screw 9 has a screw engaging portion 10
Are engaged with each other, and the screw engaging portion 10 is fixed to a plate 11, and the plate 11 includes, for example, four guide rods 1.
The upper ends of the two are connected to each other. Guide rod 1
Reference numeral 2 penetrates the arm 1 and is connected to the slide block 13.

Therefore, when the electric motor 8 is driven, the shaft 5 rotates via the chain or belt 7, the ball screw 9 rotates and the plate 11 engaging with it moves up and down, and the slide block 13 via the guide rod 12. Moves up and down.

The slide block 13 includes a driving block 1
4 is installed. The driving block 14 has a pair of driving blow pins 15 and a stripper plate 18 which is connected to piston rods 17 which are respectively engaged with a pair of pneumatic cylinders 16 and which is vertically movable. The stripper plate 18 presses the upper end of the parison sandwiched by a pair of molds 19 arranged directly below the driving blow pin 15.

The die head 2 is adjacent to the driving block 14.
0 is fixed to the support base 21. The die head 20 pushes out the parison from the die core 22 at the lower end thereof. A pair of cavities 2 that hold a pair of extruded parisons
The die 19 forming 3 is placed directly below the die core 22 and holds the parison, and then the die 19 is driven by the driving blow pin 15
Move right under.

When the die 19 moves right below the driving blow pin 15, the electric motor 8 is driven to lower the slide block 13, and the driving blow pin 15 is inserted into the parison sandwiched by the die 19, and By driving the pneumatic cylinder 16 and pushing down the piston rod 17,
The stripper plate 18 descends and presses the upper end of the parison protruding from the mold 19.

When the driving blow pin 15 is pushed into the mold 19, the cutting sleeve 25 of the driving blow pin 15 contacts the counter plate 26 of the mold 19 to cut the parison protruding from the mold 19. , Mold the mouth of the molded product. Then, air is blown into the parison from the driving blow pin 15 to expand the parison along the cavity 23, and the molding is completed.

The molded product is cooled by the mold, but since the parison protruding upward is not normally in contact with the mold, only cooling by air requires a cooling time. Therefore, the stripper plate 18
By pressing the upper end of the parison protruding from the counter plate 26, the upper part of the parison is compressed and pressed against the upper part of the mold 19 to cool the upper burr by the mold.

Therefore, in order to adjust the abutting amount between the cutting sleeve 25 of the driving blow pin 15 and the counter plate 26, the electric motor 8 is a servo motor, and the pulse encoder 27 for detecting the pulse thereof is used.
And the servo amplifier 2 as shown in FIG.
8. An operation display 29 and a sequencer controller 30 are provided. Then, the servo amplifier 28 and the operation display unit 29 are connected to the corresponding positioning unit of the sequencer controller 30.

Next, in the automatic driving height adjustment, the diameter of the product is input to the operation display to calculate the optimum driving force, and the driving lowering position and the driving force are controlled based on this value. Specifically, when the torque of the electric motor 8 can be arbitrarily set, the mold 19 and the driving blow pin 15 are aligned at the centers, and then they are lowered at a low speed, and when the counter plate 25 and the cutting sleeve 26 hit each other. Is detected, and the value of the pulse encoder 27 at this time is used as the positioning command point.

That is, as shown in FIG. 4, while commanding automatic height adjustment on the operation display 29 and inputting the product diameter (Dmm), the driving force (Fkgt) and the torque value (Tkgcm) are calculated. And ask for the ratio to the rated torque. The driving force is the formula (1), the torque value is the formula (2), and the ratio to the rated torque is the formula (3).
Each is required.

[0025]

Formula 1 F = Dπ × A × N A = constant, N = number

[0026]

[Equation 2] T = F · L / 2π · η L = ball screw lead η = ball screw efficiency

[0027]

[Formula 3] x = T / Tm Tm = Rated torque of electric motor 8 Therefore, when the electric motor 8 descends at a low speed, the pulse encoder 27 detects the motor torque, and the motor torque reaches the calculated torque value, the electric motor 8 is After stopping, the pulse encoder 27 reads the pulse value, writes the driving down command point, returns the driving up origin and ends.

[0028]

As described above, according to the present invention, the work of adjusting the driving height, which was always performed by the operator in the past when the setup of the molded product was changed, is automated in the present invention, so the labor of the operator is reduced. In addition to eliminating risks, safety management is possible and downtime for starting molding is reduced.

Further, since the optimum driving height is automatically adjusted, it is possible to prevent abnormal wear and damage of the cutting sleeve and the counter plate due to an operator's adjustment error.
Therefore, the life of the cutting sleeve and the counter plate can be improved.

Further, since the optimum driving force can be calculated corresponding to the molded product, the driving force does not exceed the required value, and the power consumption can be reduced and the life of the cutting sleeve and the counter plate can be improved.

[Brief description of drawings]

FIG. 1 is a side view showing a driving device of a blow molding machine to which the present invention is applied.

2 is a front view of FIG.

FIG. 3 is a system diagram of the present invention.

FIG. 4 is a system flow chart of the present invention.

FIG. 5 is a side view showing a driving device of a conventional blow molding machine.

6 is a side view of FIG.

7 is an enlarged cross-sectional view of the main part of FIG.

[Explanation of symbols]

 8 ... Electric motor 9 ... Ball screw 10 ... Screw engaging part 13 ... Slide block 14 ... Driving block 15 ... Driving blow pin 18 ... Stripper plate 19 ... Mold 24 ... Product 25 ... Cutting sleeve 26 ... Counter plate 27 ... Pulse Encoder 28 ... Servo amplifier 29 ... Operation display 30 ... Controller

Claims (3)

[Claims] 1. When adjusting the driving height of a blow molding machine, the optimum driving force is calculated by inputting the product diameter, and the driving blow-down position and driving force of the driving blow pin are controlled based on this value. A method for automatically adjusting the driving height of a blow molding machine, which comprises: 2. The driving blow pin of the hollow molding machine is configured to be able to move up and down by driving an electric motor, and the torque of the electric motor can be arbitrarily set so that the center of the die and the driving blow pin are aligned. It is lowered at a low speed above, the torque rise when the die counter plate and the cutting sleeve hits is detected, and the value of the pulse encoder at this time is used as the positioning command point. Automatic adjustment method. 3. A servo motor having a pulse encoder, a servo amplifier, a ball screw rotated by the servo motor, a drive blow pin mounted on a slide block which is engaged with the ball screw and moves up and down, and a product diameter are inputted. A driving device for a hollow molding machine, comprising: an operation display device for calculating a driving height and a torque value to obtain a ratio to a rated torque and a controller thereof.